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Lystrosaurus was the largest creature on land in the early Triassic, why did they need burrows? What were they hiding from?

(less seriously, why were they so ugly?)

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    $\begingroup$ Maybe they were hiding from the weather? E.g. bears are pretty big, but they find places to hibernate in the winter. Or perhaps they inherited the burrowing habit from a smaller ancestor? As for their looks, it's in the eye of the beholder. I think they're kinda cute :-) $\endgroup$ – jamesqf Sep 14 '17 at 5:00

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